Create CONTRIBUTING.md

Author: matthewmateo

CONTRIBUTING.md

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+# Contributing
+
+Contributions to Primo are very welcome. You can start by submitting a PR to address any of the [open issues](https://github.com/primocms/primo/issues), but for the sake of keeping the codebase simple and aligned towards the project's mission, we ask that you first start a discussion before attempting to contribute any new features. You can do this by starting a discussion in the [Forum](https://forum.primo.so), [Github Discussions](https://github.com/primocms/primo/discussions), or the [Discord](https://discord.gg/vzSFTS9). Or, if you'd like to contribute to the project but don't know where to start, feel free to fill out the [contributor form](https://primocms.org/contributions).
+
+## Running locally
+
+1. Clone the main Primo repo 
+```
+git clone https://github.com/primocms/primo.git
+```
+2. Clone the builder repo
+```
+git clone https://github.com/primocms/builder
+```
+3. Link the builder to Primo 
+```
+cd builder
+npm link
+npm install
+npm run package-watch
+```
+4. Run Primo
+```
+cd ../primo
+npm install 
+npm link @primocms/builder
+npm run dev
+```
+5. Open your browser to http://localhost:5173
+
+If you have any issues setting this up, it's probably *not* just you, so feel free to pop into any of the discussion spaces linked above for some help.